These last few days, GRRM has been attending this years WorldCon, and from people attending we have learned the following:

GRRM is still aiming for six books.

There are twelve chapters in A Feast for Crows which grew out of the original prologue. Seven deal with the Iron Islands and five with Dorne.

There's a strong possibility that a 2-hour pilot based on GRRM's old anthology series, Wild Cards, may be produced by Sci-Fi. If it happens, and if it does well, there's a possibility that it'll become a weekly series.